0.1.4
 - Fixes of Navier-Stokes solver
0.1.3
 - Add convection-diffusion-reaction solver
 - Add Navier-Stokes solver
 - Change order of arguments (add dw)
0.1.2
 - Add solver for bistable equation
 - Add user manual
0.1.1
 - Add time-dependent convection-diffusion solver
 - Add heat solver
0.1.0
 - First version of Puffin
